摘要
采用土壤添加Pb和叶面喷施Pb溶液的方式,分别研究了土壤Pb和大气Pb在玉米植株各器官中的积累规律和Pb污染浓度与籽粒Pb含量、叶片Pb含量与籽粒Pb含量的相关性,以及土壤Pb和大气Pb对玉米籽粒Pb的贡献率。结果表明:土壤添加Pb后,玉米各器官中Pb含量表现为根>茎>叶>籽粒,且主要富集在根系中;叶面喷施Pb后,玉米各器官Pb含量大小顺序是叶片>茎、根>籽粒,且主要富集在叶片中;随着土壤和大气Pb浓度的增加,玉米各器官Pb含量均呈现不同程度的增加;玉米籽粒中的Pb含量与土壤和叶片Pb浓度呈显著正相关(P<0.01);土壤施加Pb的毒性临界值为118.95mg.kg-1;大气Pb对玉米籽粒的贡献率为53.7%,土壤Pb对玉米籽粒的贡献率为46.3%,说明大气Pb通过叶面传输是玉米籽粒吸收Pb的重要途径。
By foliar spraying Pb to simulate atmospheric Pb and by adding Pb into soil to simulate soil Pb, this paper studied the accumulation and allocation of atmospheric and soil Pb in maize plants, the relationship between leaf and seed Pb contents, and the contribution rates of atmospheric and soil Pb to seed Pb. After foliar spraying Pb, the Pb concentration in maize organs was in the order of leaf 〉 stalk, root 〉 seed, mainly allocated in leaf; after adding Pb into soil, the Pb concentration in maize organs was in the order of root 〉 stalk 〉 leaf 〉 seed, mainly allocated in root. With the increase of atmospheric and soil Pb concentration, the Pb concentration in the organs increased to different extents. There was a significant positive correlation between the seed Pb concentration and the Pb concentrations in soil and leaf （P〈0.01）. The toxicity threshold value of Pb added in soil was 118.95 mg·kg-1. The contribution rates of atmosphere and soil Pb to seed Pb were 53.7% and 46.3%, respectively, suggesting that foliar transfer of atmospheric Pb was the dominant pathway for the Pb intake of maize seeds.
出处
《生态学杂志》
CAS
CSCD
北大核心
2012年第9期2299-2304,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(81102765)
辽宁省科技计划项目(2010415015)资助
关键词
铅
玉米
大气Pb
土壤PB
贡献率
Pb
maize
atmospheric Pb
soil Pb
contribution rate.
